Failure of systemic analgesic agents to alter the absolute sensory threshold for the simple detection of pain.
D001241:Aspirin / Q000494:pharmacology; D002986:Clinical Trials as Topic; D000431:Ethanol / Q000494:pharmacology; D006358:Hot Temperature; D006801:Humans; D008614:Meperidine / Q000494:pharmacology; D009482:Neurophysiology; D010146:Pain / Q000175:diagnosis*; D012882:Skin Tests
D000431:Ethanol; D008614:Meperidine; D001241:Aspirin